Improvement in scroll-sawing machines



UNITE STATES VM. H. DOANE, OF CINCINNATI, OHIO.

IMPROVEMENT IN SCROLL-SAWING MACHINES.

Specification forming part of Letters Patent No. 418A 6l, dated June 13, 1865.

To all whom t may concern:

Be it known that I, W. H. DOANE, of Gincinnati, Hamilton county, State of Ohio, have invented certain new and useful Improvements in Scroll-Saw Machinery; and I do hereby declare that the following is atull7 clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l is a vertical longitudinal section through the center of the pedestal-support `for the driving mechanism for the saw. Fig. 2 is a front elevation of Fig. 1. Fig. 3 is a top view of Fig. 2 with the pedestal-top removed. Fig. 4 is a diametrical section through the saw-stock, having its lower end broken ofi'. Fig. 5 is a top view of a table-guide for the saw. Fig. 6 is an end View of this guide.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to certain novel improvements in constructing, guiding, and driving the saw-stock of scroll-cutting saws; also to improvements in supporting the driving or crank shaft, and connecting this shaft to the saw-stock in such manner that a much longer stroke thereof can be obtained in a very low table, all as will be hereinafter described.

To enable others skilled in-the art to make and use my invention, I will describe its construction and operation.

In the accompanying drawings, A A represent a pedestal, which is intended to serve as asupport for thetopB,and also the mechanism used to drive the scroll-saw a. This pedestal A A is hollow, being cast in two parts, and receives within it that end of the drivingshaft 0 which carries the crank-wheel O', and also the pitman D, which communicates a reciprocatin g motion to the vertical saw-stock E. The shaft C is supported in a horizontal position by means of two pillow-blocks, F F, one of which, F, is mounted on the top ofthe detachable base-piece A' of the pedestal, and the other is arranged within this pedestal and bolted to the bottom surface of said base, as shown in Figs. 1 and 7. The lower end of the pitman D is suitably pivoted to the face ofthe Vcrank-wheel C and eccentric with its axis, and

the upper end of this pitman is pivoted toa flat-sided slide, a', which forms a part of ,the saw-stock andan offset from its back side. This be tightened up by means of the bolt c.

slide has a conical wrist-pin, b, formed on its end, which tits into a correspondinghole made through the upper end ofthe pitman D. A bolt, c, having a head on one end, is now passed outward through a hole which is made through the center of the combined slide and wrist-'pin a' b and the solid portion of the saw-stock E, and receives a nuton its outerend, which draws the head of this bolt snugly against the end ofthe cone b, and thus prevents the ptman from becoming detached therefrom. The conical wrist-pin b is of greater diameter near its base than the seat in which it ts,in orderthat it shall not enter the seat the fullextent of its length when the parts are first adjusted for use, and thus when the seat or pitman-eyeenlarges and the parts work loose, theconnections may The location of the combined slide and wrist-pin c and b is as near the upper end ot the sawstock E as it can be placed, and hence I can give this stock a long stroke and still bring the mechanism for operatingitintoavery compact vertical space, which enables me to reduce the y height ofthe table and thus make it more convenient for the workman; and it will also be seen that I confine all the driving parts for the saw-stock within the compass of the pedestal A, and thus get them out of the way and out of sight. tween two adjustable jawguides, e e, which are bolted to a removable face-plate, G, as shown in Figs. l, 2,and 3. The screws or bolts which secure the guides e e to the face-plate G pass through oblong slots through the guides, and when these screws are loosened the guides can be set up closely to the fiat sides of the slide a', and thus the saw-stock can be adj usted at any time with little or no trouble, so as to set `the saw and keep it in its proper position.

`this is solid. By thus making the cylindrical stock hollow or tubular I secure lightness without detracting materially from its strength.

The slide d works up and down be- V The upper end of this saw-stock is adapted to receive the lower end of the saw in the usual manner-t'. e., it isrecessed to receive the split plug h, between which the end of the saw is confined by means of a tightening-screw, t', Which is tapped through the stock, as shown in Fig. 4C.

The face-plate G is bolted or otherwise secured rigidly to the outside ofthe pedestal, and it can be readily removed from the latter at pleasure,together with the saw-stock and the guide-plates, when vit is desired to get at the lparts on the inside of' the pedestal.

The saw passes up through a hole which is made through the topB and also through ahole Which is made through the metal plate K that is affixed to the table. 0n the bottom side of this plate, which is let into the tabletop so as to be iush With its upper surface, I secure a slotted piece of steel, n, having a back piece, n', formed on it. The saw passes through the slot in n, and its back edge touchesn'. By thisarrangement the sa1 has a back support and also side guides which prevent any buckling or straining when sawing very thick stuff, as said guides and support are thus brought very close to the Work placed upon the top B.

lt is a matter of much importance to have scroll-saws and their connections applied to a firm structure in order to obviate bad defects in the Work done, due t0 shaking or vibrating ofthe machine. I have found that a hollow pedestal gives the desired firmness of support, and it, at the same time is comparatively light and cheap when compared with a solid support. It also answers to inclose the pitman and its immediate connections almost wholly, and by being constructed open at one side and with a removable face-plateover such open side, access to the pitman connections is rendered easy.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. Connecting the pitman D to the upper end of a scroll-saw stock by means of the conical bearing b on the end of the slide ot', and a bolt, c, passing through the stock, substantially in the manner and for the purpose described.

2. The combined conical Wrist-pin and slide a b formed on or attached to the saw-stoclr, substantially as described.

3. The hollow cylindrical stock E, in combination with a combined Wrist-pin and slide, which Works in guides at the back of the stock, substantially as and for the purpose described.

4:. The arrangement of the back and side guides, n n', on a plate, k, attached to the table B, substantially as described.

vv. H.. DOANE.

Witnesses:

WiLLIAM G. HARD, W. A. CRoss. 

